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(11) | EP 1 650 857 A3 |
(12) | EUROPEAN PATENT APPLICATION |
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(54) | Device for the power factor correction in forced switching power supply units". |
(57) The present invention describes is a device for power factor correction in forced
switching power supply unit, comprising a converter (20) and a control device (100)
coupled with the converter (20) so as to obtain from an input alternating mains voltage
(Vin) a direct regulated voltage (Vout) on the output terminal. The converter (20)
comprises a power transistor (M) and the control device (100) comprises an error amplifier
(3) having in input on the inverting terminal a first signal (Vr) proportional to
the regulated voltage (Vout) and on the non-inverting terminal a reference voltage
(Vref), a drive circuit (4-7, 10) of the power transistor (M) coupled with the output
terminal of the error amplifier (3). The control device (100) comprises means (42,
Cff, 101, Rt, 102) suitable for generating a current signal (It) representative of
the effective input voltage; said current signal (It) is in input on the inverting
terminal of said error amplifier (3) to vary said regulated voltage (Vout) in reply
to variations of the effective input voltage.
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